The two with hesitation revealing trouble (6)
I believe the answer is:
bother
'trouble' is the definition.
(I know that trouble can be written as bother)
'the two with hesitation' is the wordplay.
'the two' becomes 'both' (synonyms).
'with' is a charade indicator (letters next to each other).
'hesitation' becomes 'er' (sound made while hesitating - um, er).
'both'+'er'='BOTHER'
'revealing' is the link.
(Other definitions for bother that I've seen before include "Fuss and nuisance" , "Annoy or pester" , "Annoy, disturb" , "Worry; fuss" , "Hassle - drat!" .)